Muffler Delete

txchevy4ever · February 3, 2015

Anyone know of a good shop in the Dallas/Ft Worth area (I'm in Las Colinas) that does muffler deletes?

Chad2815 · February 10, 2015

Did anyone notice a difference in mpg after doing this mod?

2014 Sporty Shorty · February 10, 2015

I know it's been forever but I thought I'd give an update. I've done a few things now and went back on my words of keepong it mostly stock ha ha. Right now as it sits, I've gone with American Racing 1-7/8 longtubes, built my own side exit 4" exhaust , a comp cam, NX 75 kit with different jets, a K&N intake, a circle D 2800 stall, east coast gear 4.10s front and back, and a custom HP tuners tune. Off nitrous it made 407whp and 385 lbft. Just done my first 4 runs on the dyno with nitrous this past weekend and we got it up to 486whp and 470 lbft. I went to the track before the winter and my best run was a 12.91 @ 104 MPH with a 1.71 60 ft. That had a conservative tune on it though and I was only making 391whp. I'm hoping with the nitrous to get below a 12.5 so come spring I'll post some new videos. Before the winter I would average 26mpg on the highway and about 15 in the city. For reference, I get about 2 MPG better on the highway now and only lost 1 in the city.

hutch08 · February 10, 2015

Did anyone notice a difference in mpg after doing this mod?

Absolutely not, the exhaust flow is negligible... as will the change in MPG. Benefit strictly for sound only.

Chad2815 · February 11, 2015

Thanks for all the input guys, did mine today and left the flapper in. It's sounds perfect for me, I had an 07 Avalanche with the resonator removed and a Borla XR1 muffler and the delete on this truck sounds exactly like that one did. I have the 6.2 and glad I can finally hear it, best 60 bucks I have ever spent!

hutch08 · February 13, 2015

I've got a few hundred miles on this mod now and still am pleased with it. I can hear a faint "helicopter" sound on the highway when it kicks into v4 mode, but it's not annoying... just noticeable. Haven't towed with it so I can't comment on drone.

Only thing that pisses me off is the "ting-ting-ting" rattle of the damn flapper at idle... makes my 50g truck sound like a jalopy tin can!

Chad2815 · February 15, 2015

Yeah I heard that today too, seems like it goes away when it warms up though.

Chad2815 · February 25, 2015

Is it just me or does it feel like the throttle picked up some responsiveness after the delet?

timber74wolf · March 14, 2015

So with the muffler delete; there was no MPG increase or decrease. How about performance... any increase or decrease?

Chad2815 · March 14, 2015

No changes in mpg but that ting- ting idle noise at idle has picked up quite a bit in mine. I will probaly put a muffler back on and take out the resonator if I can't find a fix. Really sucks because it sounds so good in the highway and at idle after startup.

Gmc-dude · March 16, 2015

did this and love it!!!

runding · March 21, 2015

Hey everyone, I'm a newbie here but wanted to say thanks for this informative thread.

I initially did a muffler delete along with the valve and tried to "live with" the drone. After 2 weeks I finally caved and went back to my muffler guy and had him re-install the valve.

Obviously I've had a chance to hear the exhaust with and without the valve and will say that it definitely sounded meaner in V8 mode without the valve. With that being said, it's still as loud when getting on the gas with the valve but IMO 75% quieter when droning (there is still a slight flutter but not like the "black hawk" sound as someone pointed out earlier.)

Ultimately I'm happier with the valve despite losing a bit of a growl when in low RPM which I will miss. Future plans are to tune the AFM out but not quite comfortable taking that plunge with only 1800 miles on the truck.

Sent from my iPhone using Tapatalk

Chad2815 · April 3, 2015

Anyone figure out how to eliminate the "ting ting" noise. I figured out mine is doing it when the valve closes all the way and then opens at idle and the. I also had the air rush noise at low RPM. For now I have a clamp on it that allows it to open all the way but not close completely, that has fixed all the above problems but you also get a lil V4 drone. I don't mind the drone that much but it sounds perfect when everything isn't tinking and swooshing ( best way I can describe mine). Still sounds really really close to the way my Avalanche did with the Borla installed.

theloneracer86 · April 10, 2015

Anyone know of a good shop in the Dallas/Ft Worth area (I'm in Las Colinas) that does muffler deletes?

I had mine done at B&B Muffler of Crosby and 35. I might need to go back because my exhaust is rattling when i rev it it up and then let off the gas. not sure where its coming from. could it be the flapper valve rattling ?

Update : clamped the valve open rattle stopped.

Chad2815 · April 10, 2015

I had mine done at B&B Muffler of Crosby and 35. I might need to go back because my exhaust is rattling when i rev it it up and then let off the gas. not sure where its coming from. could it be the flapper valve rattling ?

Update : clamped the valve open rattle stopped.

Yep mine did the same, it happens when the valve closes, seems like it closes all the way rattles then the pressure pushes it back open, then it closes, rattles and keeps repeating.